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Inelastic displacement ratio of near-source pulse-like ground motions

机译：近源脉冲状地震动的非弹性位移比

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摘要

Near-source pulse-like records resulting from rupture's directivity have been found to depart from so-called ordinary ground motions in terms of both elastic and inelastic structural seismic demands. In fact, response spectra may be strong if compared with what is expected from common ground motion prediction equations. Moreover, because not all spectral ordinates are affected uniformly, a peculiar spectral shape, with an especially amplified region depending on the pulse period, may follow. Consequently, inelastic seismic demand may show trends different to records not identified as pulse-like (i.e., ordinary). This latter aspect is addressed in the study reported in this short communication, where a relatively large dataset of identified impulsive near-source records is used to derive an analytical-form relationship for the inelastic displacement ratio. It is found that, similar to what was proposed in literature for soft soil sites, a double-opposite-bumps form is required to match the empirical data as a function of the structural period over the pulse period ratio. The relationship builds consistently on previous studies on the topic, yet displays different shape with respect to the most common equations for static structural assessment procedures.
机译：在弹性和非弹性结构地震需求方面，已经发现了由破裂方向性引起的近源脉冲状记录与所谓的普通地震动不同。实际上，如果与普通地面运动预测方程式所期望的相比，则响应谱可能会很强。此外，因为不是所有的光谱纵坐标都被均匀地影响，所以可能出现特殊的光谱形状，其具有取决于脉冲周期的特别放大的区域。因此，非弹性地震需求可能显示出与未标识为脉冲状（即普通）的记录不同的趋势。在这则简短的通讯中报道的研究中解决了后一个方面，其中使用了相对较大的已识别脉冲近源记录数据集，以得出非弹性位移比的解析形式关系。已发现，类似于文献中关于软土场地的建议，需要使用双对立凸点形式，以将经验数据与结构周期在脉冲周期比率上的函数进行匹配。这种关系始终以先前对该主题的研究为基础，但相对于静态结构评估程序的最常见方程式而言，显示出不同的形状。

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